(19)
(11) EP 2 957 715 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.12.2015 Bulletin 2015/53

(43) Date of publication A2:
23.12.2015 Bulletin 2015/52

(21) Application number: 15168402.4

(22) Date of filing: 20.05.2015
(51) International Patent Classification (IPC): 
E21B 43/08(2006.01)
E21B 43/04(2006.01)
 E21B 33/124(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA

(30) Priority: 20.05.2014 US 201414282692

(71) Applicant: Weatherford Technology Holdings, LLC
Houston, TX 77056 (US)

(72) Inventors:
  • Broussard, John
    Kingwood, Texas 77345 (US)
  • Hall, Christopher, A.
    Houston, Texas 77041 (US)

(74) Representative: Shanks, Andrew 
Marks & Clerk LLP Aurora 120 Bothwell Street
Glasgow G2 7JS
Glasgow G2 7JS (GB)

   


(54) ASSEMBLY FOR TOE-TO-HEEL GRAVEL PACKING AND REVERSE CIRCULATING EXCESS SLURRY


(57) A treatment assembly treats zones of a horizontal borehole. For example, the assembly can gravel pack a zone by delivering slurry down a workstring. The slurry exits the workstring's outlet and pass to the borehole annulus of the zone through a flow port in the assembly. The gravel in the slurry can pack the borehole in an alpha-beta wave from toe to heel, and the fluid returns from the borehole flow through a screen back into the assembly. After gravel packing, operators remove excess slurry from the workstring by reverse circulating down the assembly to carry the excess slurry uphole through the workstring. Closures on the assembly prevent the reverse circulation from communicating through the screens to the borehole annulus. Additionally, flow valves can be used on the flow ports to selectively open and close them.







Search report









Search report